<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%
    String _name=(String)session.getAttribute("USER_LOGIN");
    if(_name==null){
        out.print("<script>alert('您还没有登录，不能访问');window.location.replace('login.jsp');</script>");
        return;
    }
%>
<span>当前用户:<%=_name%>,<a href="logout.jsp">退出</a> </span>
